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Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Technician (only for users in the US for now) and get all the help you need. Goodluck!

Click "Next" for the UnlockWizard to connect to the Internet. Note, if you are using AOL, MSN, ATT WorldNet, or a similar Internet Service Provider, you will need to start the service before clicking "Next".

If you want to test the maps on your new Garmin you can do one of two things. Either you can copy the maps onto an SD card and then insert the card into your GPS. You can also connect the GPS to your computer with the USB cable that was supplied with you unit. Using whatever file manager you normally use with your version of Windows (Windows Explorer, Total Commander, etc), you will be able to see your Garmin GPS as another drive on your system. You can then copy your City Select maps over to your Garmin.

Once you have the maps either directly on your Garmin GPS or on a microSD card, you have to choose to use those maps. From the main screen of your GPS choose Tools>Settings>Map. If your City Select maps are compatible with your GPS they will show up in the list of maps. To make use of the map just choose it by touching the name of the map. Your Garmin will then load that map and display it. If your City Select maps do not show up in the list, or if you choose them and they do not load or give you an error then they are not compatible with your 1490T.

If you need anymore information or help please let me know. Thank you.

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Related Questions:

On my Nuvi 200, after "Where To?", you have to select "Address". My instruction book says: 2.Change the state, country or province if necessary. 3.Touch "Spell City", enter the city/postal code, and touch "Done". Select the city/postal code in the list. (Not all map data provides postal code searching). If you are unsure of the city, touch "Search All". There are further steps, but "Depending on the version of maps loaded on your nuvi, the button names can change and some steps could be ordered differently".

Click "Next" for the UnlockWizard to connect to the Internet. Note, if you are using AOL, MSN, ATT WorldNet, or a similar Internet Service Provider, you will need to start the service before clicking "Next".

The manual can be downloaded from Garmin.www.garmin.com/manuals/3130_OwnersManual.pdf

1. Touch Where To? > Address. 2. Change the state, the country, or the province, if necessary. 3. Touch Search All. If you know the city, touch Spell City, enter the city/postal code, and touch Done. Select the city/postal code in the list. (Not all map data provides postal code searching.) 4. Enter the number of the address, and touch Done. 5. Enter the street name, and touch Done. 6. Select the correct street in the list, if necessary. 7. Touch the address, if necessary.

The "Can't Unlock Maps" message appears because the unlock code is missing from your satnav. To solve this problem follow the instructions below:

Remove any
microSD / SD cards in the device

To
retrieve unlock codes you need to have your satnav registered with
garmin. If you haven't already registered it connect the satnav to your
computer and go to https://my.garmin.com/mygarmin/customers/myGarminHome.faces
and click "Register your garmin device". Follow the prompts. You'll be
asked to create a username and password. Write them down and keep them
safe. You'll need them anytime you need to update your maps or solve
problems in the future.

To
retrieve unlock codes you need to have your satnav registered with
garmin. If you haven't already registered it connect the satnav to your
computer and go to https://my.garmin.com/mygarmin/customers/myGarminHome.faces
and click Register your garmin device. Follow the prompts. You'll be
asked to create a username and password. Write them down and keep them
safe. You'll need them anytime you need to update your maps or solve
problems in the future.

If you know where your father was when he locked it (according to garmin support page), you can go back to where he was when he locked it and it will automactically unlock without code. If you do not know the location you can google the phrase "garmin unlock utility", there you will find free downloads. Otherwise, Garmin will require original receipt and charge you a fee for the service. Hope this helps, good luck.

Install the Garmin City Navigator Cd to your pc and then connect ur garmin to ur pc with the USB cable.You might have to unlock the maps with information provided with ur garmin like ur unit ID and ur unlock code.Another possiblity is that ur memory card is gotten corrupted so try installing it on a different micro sd card. Let us know if u have any luck.

The unit comes with a base map. You will need to purchase City Navigator software if you want more detailed maps which will show all roads. If the box contained a copy of the City Navigator and you threw away the code, you'll have to purchase another unlock code from Garmin.